Sterilant Gas Detection System

Complete Gas Detection and Monitoring Solutions

For Worker Safety, Quality, and Productivity

The Australia’s leading manufacturers of disinfectants for healthcare, floor maintenance and industrial cleaning products has chosen the SafeCide™ for real-time measurement of Peracetic Acid PAA vapor concentrations in parts per million (PPM) at their main production facilities in the Hunter Region of New South Wales. The SafeCide™ gives employees peace of mind they are safe while minimizing disruptions to production related operations. SafeCide provides fast, accurate, real-time measurements of chemical vapor – giving you the ability to prevent or address concerns in real-time.

ChemDAQ® helps you maintain a safe, productive work environment by providing best-in-class monitoring products for Peracetic Acid, Hydrogen Peroxide, and Ethylene Oxide. Monitoring the air around potentially hazardous chemicals sets a higher standard of safety and quality at any facility.

Gas Monitors are installed in areas close to the source but also near the workers’ breathing zone for improved safety and accurate, timely detection. System peripherals ensure that gas monitoring and display points meet the needs of your unique facility and staff. Chemical biocides are effective and essential tools for preventing the spread of disease in hospitals as well as for food safety and longevity of shelf life, however, they can also have health risks for the people who use them in their work.

  • Gas proprietary sensor module for

    Peracetic Acid

    Ethylene Oxide

    Hydrogen Peroxide

  • Unique Sensor Calibration/Exchange Program

    Sensor Exchange Program (SXP®) virtually eliminating systems maintenance

  • Spot-On® ethylene oxide filter

    eliminates false alarms from common background interferents such as alcohols and carbon monoxide.

  • EnviorCell™ Snap-in Sensor module

    Hot swappable module – ChemDAQ EnviorCell™ Snap-in Sensor module / EnviorCell Snap-in factory calibrated replacement sensor modules

SafeCide provides fast, accurate, real-time measurements of chemical vapor

AquaGas Pty Ltd – Enews November 2016

We are delighted to announce the recent acquisition of several major projects in the field of Continuous Emissions Monitoring (CEMS) and industrial process control.


Continuous Emission Monitoring System

Prony Power Station in New Caledonia

AquaGas Pty Ltd, has been awarded a major contract for the supply, integration, installation and commissioning of two complete CEMS (Continuous Emission Monitoring System) used for compliance stack emissions monitoring of Prony Power Station located at one of the largest mining facilities located in southern hemisphere.

In this project, AquaGas has selected the LaserCEM (AP2E) and DR-320 R (DURAG) as the most suited technologies with regards to the application requirements and harsh monitoring conditions, providing the plant operator ENERCAL with the last generation of CEMS multigas analyser and dust monitors for online analysis of Particulates, HCl, SO2, NO, NO2, CO, CO2 and O2 at their two coal fired boiler facilities.

AquaGas scope also includes CDAS, Mcerts certified and state of the art data acquisition and reporting software suite. The CDAS software package ensures strict emissions reporting and clear environmental compliance.

The strong partnership with AP2E, expert in Laser Spectroscopy, and DURAG specialised in the field of environmental monitoring and process control has led to this first shared success, the acquisition of a capital reference for the LaserCEM in the field of power generation while enforcing AquaGas position in Oceania.

Prony Power Station is located on VALE mining site providing access to large port facilities for the supply of combustible. It consists of two 55 MW Alstom boilers (203 t/h – 87 bars – 515°C) equipped with Alstom turbines (85 bars – 500°C) and alternators (59 MVA – 11 kV) providing power for both the public demand and the needs of the large Nickel mining facilities.

Located close to the site and focused on customer satisfaction, AquaGas has implemented an efficient transfer of knowledge to the plant owner as well as to the local company ROBICAL assigned for the CEMS routine maintenance.


Continuous Emission Monitoring System

Caltex Lytton refinery in Australia

Caltex has recently approached AquaGas to perform a system expertise at their Lytton refining facilities near Brisbane.

The difficulties experienced by Caltex with their CEMS (Continuous Emission Monitoring System) had been related to the existing sampling method and resulted in a high maintenance level and unreliable monitoring operations.

Thanks to the customer feedback and following a couple of site visits, AquaGas has identified several ways to optimise the existing CEMS (Continuous Emission Monitoring System) sampling method. In order to secure the data availability and keep the maintenance requirements to their minimum, AquaGas Pty Ltd has supplied, integrated and installed a set of heated gas sampling probes:

  • ASP300

    At the boiler facilities, the ASP300 fitted with automatic blowback, calibration port in accordance with CEMS standards and a continuous soot removal system.

  • ASP400

    For the Thermal Oxidiser, the ASP400 equipped with automatic blowback, calibration port in accordance with CEMS standards and designed to handle high dust load as well as elevated process gas temperatures.

Both the ASP300 and ASP400 provide the plant operator with application specific features and innovative design resulting in a series of advantages:

  • Programmable back-flush sequences,
  • Calibration as per CEMS code,
  • Extended filtration surface,
  • Flue gas temperature measurement
  • Insitu filters – The ASP’s allows the inspection of the Insitu or “top filter” without the need for dismounting the probe (No fitters required for inspection or maintenance).
  • Adjustable temperature set point (set at 190 degree Celsius)
  • Continuous and automated soot removal performed directly at the sampling point

For further information on Ankersmid Gas Sampling probes, you can visit our website:

Ankersmid Sampling

  • Universal

    CEMS integration made easy

  • Performant

    Field proven, high quality, durable Ankersmid Sampling BVBA patented designs

  • Modular

    Comprehensive range of gas sampling equipment from one source

  • Efficient

    Easy to install, maintain and operate

AquaGas is supporting the global industrial community with high performance environmental and process monitoring systems (Continuous Emissions Monitoring Systems, Air Quality Monitoring Systems, Online process analysers, Water Quality Monitoring Systems) specifically designed and built to meet your application requirements.

Indoor air quality


Air Quality in Submarines

The last generation of conventional submarines allows several weeks of submersion, creating a need for regenerative air purification methods and new air monitoring instruments. Submarine air is a complex mixture of compounds, where the most obvious contaminant is metabolically produced carbon dioxide. Normal eight-hour occupational exposure limits are not applicable on a submarine, instead special long-time exposure limits are set.

A number of air purification methods for submarines are either available or under development, e.g. cryogenic plants, biological plants and solid amine plants. For air monitoring, the OFCEAS method is an interesting option, already in use on-board nuclear submarines.

The main contaminant of submarine air is CO2. In ordinary buildings 1000 ppm is usually considered as a maximum concentration. This value is not based on health effects but on the rate of ventilation. In submarines, higher CO2 concentrations are permitted, usually 5000- 7000 ppm. A submarine atmosphere consists of a large number of contaminants such as ozone, which can be formed in electrical devices and hydrogen, which is formed when the batteries are charged.

To ensure the health of the crew on short and long term, it is important to specify the permitted composition of the submarine atmosphere.


Table 1 shows a submarine air specification for a conventional submarine.

Compounds Limit Compounds Limit
NO2 5 ppm NH3 25 ppm
CO2 8 000 ppm O3 0.1 ppm
CO 35 ppm H2 2 %
SO2 2 ppm CL2 1 ppm
Formaldehyde 2 ppm H2O2 1 ppm
Akrolein 0.1 ppm


Since the crew is continuously exposed to the submarine air for several weeks, normal eight hour occupational exposure levels are not applicable and special exposure limits must be determined. Maximum Permissible Concentrations (MPC) are set for an exposure time of 90 days for a number of compounds likely to be found in a submarine. They have also set emergency MPC’s for 24 h and 60 min.

The ProCeas® NAV

The ProCeas® NAV is designed for online monitoring of CO2, CO, Freon, H2S, H2, O2, Formaldehyde (…) in nuclear and conventional submarines. The ProCeas® NAV uses the OFCEAS method commercialized by Ap2e of France.

ap2e-CEMS and Process Analysers

The OFCEAS system uses a high-finesse optical cavity to provide path lengths of tens of kilometres. Moreover the OFCEAS technology can also, in certain configurations, take advantage of broadband light sources to provide multi-component analysis, while offering improved sensitivity when compared with shorter path-length methods, such as Tunable Diode Laser absorption spectroscopy (TDLAS).

ProCeasNAV-indoor air quality in submarines

The ProCeas® NAV analyser has been designed to endure large temperature variations, high vibrations and englobes all criteria required by the military environment to assure long-term crew member health in a confined environment.

Some of the gases and measuring ranges available on the ProCeas® NAV are:

Carbon Monoxide CO: 0-1000 ppm – Lower Detection Limit: 1 ppm

Carbon Dioxyde CO2: 0-5% – Lower Detection Limit: 0.01 %

Hydrogen Sulfide H2S: 0-10 ppm – Lower Detection Limit: 0.1 ppm

Freon; R134a and R404: 0-1000 ppm – Lower Detection Limit: 2 ppm

Ethanol C3H6O 0-2000 ppm – Lower Detection Limit: 4 ppm

General characteristics

Response time < 10 sec

No Zero drift and no Span drift – No daily calibration required – No nitrogen, zero air, purge or other carrier gas.

Weight 15 to 20 kg

Dimensions 480 x 240 x 150 cm

Formaldehyde in Indoor Air


For continuous ambient and indoor air quality monitoring (real time at ppb levels), the ProCeas® spectrometer is equipped with a laser at a single wavelength used to determine the concentration of a specific compound with an extremely low detection limit and fast response time. The OFCEAS extended optical path and continuous signal feedback provide a high definition spectral response using what is essentially a traditional absorption measurement.


ProCeas® Formaldehyde at HUTCHINSON

As per the international OH&S regulations on Formaldehyde, Hutchinson, subsidiary of TOTAL, evaluated several technologies to implement continuous real-time monitoring of Formaldehyde at their Plant facilities.

The ProCeas® has been selected by Hutchinson as the technology the most suited to their monitoring needs in terms of response time, accuracy and flexibility around the integration within the mainstream of their installation.

Hutchinson uses the ProCeas® to measure various level of Formaldehyde in the air at 3 separated sampling locations: laboratory, offices & entrance hall.


ProCeas Key features

  • Low detection level
  • Complete pre-calibrated laser infra-red spectrometer
  • Reduced response-time with Low pressure sampling system
  • Suitable for a wide range of components in ambient air: NH3, O2, H2, H2S, HCFC, VOCs, (…)

Example of performances for the Formaldehyde

Measuring range: 0-10 ppm (up to 1%)

Lower detection limit: 1 ppb – (10 ppm at 1%)

Response time 2s

No Zero drift and no Span drift – No daily calibration required – No nitrogen, zero air, purge or other carrier gas.

Area Monitors for Sterilant Gas

Hazards of sterilant gases

Since sterilant gases are selected to destroy a wide range of biological life forms, any gas which is suitable for sterilisation will present a hazard to personnel exposed to it. The NIOSH Immediately Dangerous to Life and Health values (IDLH) for the three sterilant gases are 800 ppm, 75 ppm and 5 ppm for ethylene oxide, hydrogen peroxide and ozone respectively.

For comparison, the IDLH of cyanide gas (hydrogen cyanide) is 50 ppm. Thus exposure to even low levels of sterilant gas should not be treated casually and most facilities go to great lengths to adequately protect their employees. In addition sterilizers (as with any mechanical device) can and sometimes do fail and leaks have been reported. Continuous gas monitors are used as part of an overall safety program to provide a prompt alert to nearby workers in the event that there is a leak of the sterilant gas.Steri-Trac Area Monitors - sterilant gas - AquaGas

Monitoring Sterilant

The monitor alarms are typically set to warn if the concentrations exceed the OSHA permissible exposure limits (PELs), 1.0 ppm for ethylene oxide and 1.0 and 0.1 ppm for OH&S and ozone respectively. The PELs are calculated as 8 hour time weighted average values.

In addition to providing continuous monitoring, the better gas monitors include a computer based data acquisition system provides automatic data logging to assist with compliance with OSHA’s regulations and impending alarms that allow users to rectify problems before they become a hazard.

There are several technologies that are commonly used for the detection of sterilant gases, the main three being electrochemical, gas chromatography and metal oxide semiconductor. All three technologies are suitable for ethylene oxide, but only electrochemical sensors are used for hydrogen peroxide and ozone detection.

For ethylene oxide, metal oxide electrochemical sensors provide a low cost, long life detector offer very good sensitivity, fast alarm response times and small size. ChemDAQ gas monitor manufacturers mainly use electrochemical sensors for toxic gases because of their many advantages.

Electrochemical sensors have traditionally suffered from a cross sensitivity problems with other vapours (alcohols are especially troublesome in health care). Cross sensitivity results in false alarms, unnecessary evacuations and eventually a loss of confidence in the gas monitoring system.

AquaGas - ChemDag - Steri-trac

ChemDAQ has developed a proprietary chemical filter that allows the ethylene oxide to pass through but removes most common interferent gases and vapours (including carbon monoxide, ethanol and IPA). The use of this filter allow the ethylene oxide to be detected with all the advantages that electrochemical sensors have to offer, but without the problems of cross sensitivity.



AquaGas is supporting the global industrial community with high performance environmental and process monitoring systems (Continuous Emissions Monitoring Systems, Air Quality Monitoring Systems, Online process analysers, Water Quality Monitoring Systems) specifically designed and built to meet your application requirements.